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বাংলাদেশ জরিপ অধিদপ্তর মেনু নির্বাচন করুনDutch mathematician Willebrord Snellius (a.k.a. Snel van Royen) introduced the trendy systematic utilization of triangulation. In 1615 he surveyed the gap from Alkmaar to Breda, approximately seventy two miles (116 km). He underestimate